他听到有人发出求救的声音，就马上跑过去。

Tā tīngdào yǒu rén fāchū qiújiù de shēngyīn, jiù mǎshàng pǎo guòqù.

He heard someone cry for help and immediately ran over.

晚上树林里发出了奇怪的声音。

Wǎnshang shùlín lǐ fāchū le qíguài de shēngyīn.

At night, strange sounds came from the woods.

老师发出了一个通知，请大家周末来学校开会。

Lǎoshī fāchū le yí gè tōngzhī, qǐng dàjiā zhōumò lái xuéxiào kāihuì.

The teacher sent out a notice, asking everyone to come to school for a meeting on the weekend.